Fastener



FIG. 1 is a perspective view of front, top and right side of a fastener according to our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and

FIG. 7 is a bottom view thereof.

FIG. 8 is a cross sectional view of 8-8 of FIG. 2.

FIG. 9 is a cross sectional view of 9-9 of FIG. 2; and,

FIG. 10 is a cross sectional view of 10-10 of FIG. 2.

The broken lines represent portions of the article and form no part of the claimed design. 

CLAIM The ornamental design for a fastener, as shown and described. 